Optical Member And Backlight Device Using The Same

Abstract

There are provided an optical member which does not degrade image quality even if it undergoes changes of temperature and humidity with time inside a liquid crystal display etc. and a backlight device using the same. The optical member 1 of the present invention is constituted by forming a functional resin layer formed from a composition containing a resin having a glass transition temperature of 45° C. or higher on a base material, and curving the optical member 1 to protrude on the base material side. The backlight device 10 of the present invention is constituted by incorporating such an optical member 1 . Preferably, curved surface of the optical member 1 is constituted to have a curvature radius in the range of 1.5 to 9.0 m.

1 . An optical member, comprising:
 a base material, and   a functional resin layer formed on the base material, wherein   the functional resin layer is formed from a composition containing a resin having a glass transition temperature of 45° C. or higher, and the optical member is curved to protrude on the base material side.   
     
     
         2 . The optical member according to  claim 1 , wherein the curved surface of the optical member has a curvature radius of 1.5 to 9.0 m. 
     
     
         3 . The optical member according to  claim 1 , wherein the composition contains the resin having a glass transition temperature of 45° C. or higher in an amount of 30% by weight or more. 
     
     
         4 . The optical member according to  claim 1 , wherein the functional resin layer has a thickness not smaller than 5 μm and not larger than 40 μm. 
     
     
         5 . The optical member according to  claim 1 , wherein the functional resin layer is formed over an area of 900 cm 2  or larger. 
     
     
         6 . The optical member according to  claim 1 , which is any one of a prism sheet, a light-diffusing film, a light-reflecting film, a polarization film, a reflection type polarization film, a phase difference film and an electromagnetic wave-shielding film. 
     
     
         7 . A backlight device, comprising:
 a light source,   a plate-shaped member for projecting light of the light source from a surface other than light-entering surface, and   an optical member disposed adjacent to the plate-shaped member, wherein the optical member according to  claim 1  is disposed as the optical member so that the functional resin layer should be on the light-projecting surface side of the backlight device.   
     
     
         8 . The optical member according to  claim 2 , wherein the composition contains the resin having a glass transition temperature of 45° C. or higher in an amount of 30% by weight or more. 
     
     
         9 . The optical member according to  claim 2 , wherein the functional resin layer has a thickness not smaller than 5 μm and not larger than 40 μm. 
     
     
         10 . The optical member according to  claim 3 , wherein the functional resin layer has a thickness not smaller than 5 μm and not larger than 40 μm. 
     
     
         11 . The optical member according to  claim 2 , wherein the functional resin layer is formed over an area of 900 cm 2  or larger. 
     
     
         12 . The optical member according to  claim 3 , wherein the functional resin layer is formed over an area of 900 cm 2  or larger. 
     
     
         13 . The optical member according to  claim 4 , wherein the functional resin layer is formed over an area of 900 cm 2  or larger. 
     
     
         14 . The optical member according to  claim 2 , which is any one of a prism sheet, a light-diffusing film, a light-reflecting film, a polarization film, a reflection type polarization film, a phase difference film and an electromagnetic wave-shielding film. 
     
     
         15 . The optical member according to  claim 3 , which is any one of a prism sheet, a light-diffusing film, a light-reflecting film, a polarization film, a reflection type polarization film, a phase difference film and an electromagnetic wave-shielding film. 
     
     
         16 . The optical member according to  claim 4 , which is any one of a prism sheet, a light-diffusing film, a light-reflecting film, a polarization film, a reflection type polarization film, a phase difference film and an electromagnetic wave-shielding film. 
     
     
         17 . The optical member according to  claim 5 , which is any one of a prism sheet, a light-diffusing film, a light-reflecting film, a polarization film, a reflection type polarization film, a phase difference film and an electromagnetic wave-shielding film. 
     
     
         18 . A backlight device, comprising:
 a light source,   a plate-shaped member for projecting light of the light source from a surface other than light-entering surface, and   
       an optical member disposed adjacent to the plate-shaped member, wherein the optical member according to  claim 2  is disposed as the optical member so that the functional resin layer should be on the light-projecting surface side of the backlight device. 
     
     
         19 . A backlight device, comprising:
 a light source,   a plate-shaped member for projecting light of the light source from a surface other than light-entering surface, and   
       an optical member disposed adjacent to the plate-shaped member, wherein the optical member according to  claim 3  is disposed as the optical member so that the functional resin layer should be on the light-projecting surface side of the backlight device. 
     
     
         20 . A backlight device, comprising:
 a light source,   a plate-shaped member for projecting light of the light source from a surface other than light-entering surface, and   
       an optical member disposed adjacent to the plate-shaped member, wherein the optical member according to  claim 4  is disposed as the optical member so that the functional resin layer should be on the light-projecting surface side of the backlight device.